Type of Flash Messenger in Zend

Is it possible or How can i give a type to a FlashMessage in Zend?

For example

/* This is a "Success" message */
$this -> _helper -> FlashMessenger('You are successfully created a post.'); 

/* This is an "Error" message  */
$this -> _helper -> FlashMessenger('There is an error while creating post.');

/* This is just a "Notification" message */
$this -> _helper -> FlashMessenger('Now you can see your Post');